Study on Dimethicone Oil

Dimethicone is a chemical product with excellent performance, which is widely used in machinery, electrical, textile, paint, medicine, etc., and the demand at home and abroad is increasing day by day. The traditional catalyst used for the synthesis of dimethicone is mostly sulfuric acid, but the amount of sulfuric acid is large, and the product is acidic. In addition, the use of sulfuric acid as a catalyst also has the problem of large corrosion to equipment. It is necessary to develop a new process for synthesizing dimethyl silicone oil with high yield of target product, low cost, low investment and good environmental safety.

Dimethicone is a colorless and transparent new synthetic polymer material with a variety of different viscosities (5cps to 8 million cps), from easy-flowing liquids to thick semi-solids. This product has special smoothness, softness, hydrophobicity, good chemical stability, excellent electrical insulation and high and low temperature resistance. It has high flash point and low freezing point, and can be used for a long time at -50℃～+200℃. It has small viscosity-temperature coefficient, high compressibility, low surface tension, good hydrophobicity and moisture resistance, and small specific thermal conductivity.

When dimethylsilicone oil is prepared by co-hydrolysis of dimethyldichlorosilane and trimethylchlorosilane, due to the severe hydrolysis and copolymerization reaction and the easy introduction of other functional groups, the quality of dimethylsilicone oil is not high, and this method is rarely used to synthesize dimethicone. Methyl silicone oil. When the condensation reaction is carried out with low molar polydimethylsiloxane diol and trimethylsilanol or low molar mass MDnM, the purity of the product is not high due to the introduction of water in the reaction process, and there are still There are more hydroxyl groups, so this method is less used to synthesize dimethicone.

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